Found this outside on patio in northern Virginia, Ashburn area, September 2018. It's about 12 inches. Is it a water snake or rattlesnake?
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It looks like an Eastern Hognose Snake, which is characterized by an upturned nose and high likelihood of playing dead.
These are described as variable in coloration:
"Two color phases are common in Virginia: (1) a patterned phase (79.6%, n = 98), characterized by a series of 19-27 (average = 23.2 ± 2.4, n = 12) black or dark-brown blotches along middorsal line, with alternating black spots on sides; body color consists of varying combinations of gray, tan, pink, yellow, orange, and red; venter of body and tail immaculate cream to dark gray;"
If you replace the tan in this image (www.virginiaherpetologicalsociety.com) with gray in yours, I think the pattern match and overall body form are very similar: